kicad-developers team mailing list archive

[Andrew Lutsenko <anlutsenko@xxxxxxxxx>]

Maybe there could be "slow" and "fast" mode for spoke (or in general zone)
calculation. Fast for routing, slow for last pass.

On Mon, Jul 8, 2019 at 10:58 AM Jeff Young <jeff@xxxxxxxxx> wrote:

> Keep in mind that the total width of all the spokes (assuming they’re all
> the same length) doesn’t control the current they’ll carry, only how hot
> they will get for a given current.  Most boards are designed with a huge
> margin of error here.
>
> It’s correct that would *could* do all the calculations automatically
> (both for heat-transfer during soldering and heat-generation during use),
> but it would be *glacially* slow.
>
> Cheers,
> Jeff.
>
> On 8 Jul 2019, at 18:04, Eeli Kaikkonen <eeli.kaikkonen@xxxxxxxxx> wrote:
>
>
>
> ma 8. heinäk. 2019 klo 19.04 Evan Shultz (evan.shultz@xxxxxxxxx)
> kirjoitti:
>
>> Because of varying pad shapes, sometimes "+" spokes are best and other
>> times "x" may be preferred. So having a choice of those options, even
>> though both have the same number of thermal spokes, may be desirable. I
>> believe this is captured in the "initial angle" concept, but IMO having the
>> choice of "+", "x", "8 way", and "solid" is more obvious that picking an
>> initial angle. But perhaps I misunderstood.
>>
>
> What I have felt need for is automatically finding locations for spokes so
> that when a pad isn't fully surrounded by a zone it would still be
> connected with 4 (or as many as possible) spokes. Sometimes changing the
> direction between x and + would be enough, sometimes adding spokes from x
> to spokes of +. For example N(orth), NW, W, SW instead of just N and W.
> Because adding spokes is automatic anyways, exact positioning isn't
> important. There should be as much copper as possible (and preferably in
> many directions) while still having the thermal effect. Even the
> thicknesses of the individual spokes could be calculated automatically to
> meet the requirements. What counts is the total width of all the spokes
> together, or am I wrong?
>
> Eeli Kaikkonen
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